We need more top level users like that! I can sometimes beat any of these super users by giving a more clear answer. But they can answer a lot of questions that I simply cannot because I'm either not on the same level or because I simply lack the experience.

@MaartenBodewes Let's just hope he stays

I want to say there have been a few (at least one) other notable people who signed up, but they didn't appear to become regular users (but I can't remember who that might have been now)

@EllaRose e.g. JPA, David Wong, Matt Green all had accounts at some point / still have them but abandoned them AFAIK / IIRC

(and right now Phil's account is still unregistered so I suppose he has no real interest in staying :( )

I'm not sure there are enough quality questions to warrant that many in-demand cryptographers to regularly answer questions anyways

Plus, there is/was also the vulture (Squeamish Ossifrage) (whoever they really are), who appears to have kicked the stackexchange bucket